Thread-cutting die



Patented Jan. 10, 1928. I. I I I v UNITED STATES PATENT "OFFICE."

ALBERT J. rnancn, or narrow, ivrronreamrissrenon To ivrnacnnv MACHINEAND TOOL COMPANY, or nn'rnorr. MICHIGAN, A, coaronarrou or MICHIGAN. a iI 'rnn-nancutrrme ,nrn. Application filed July 31,1926. Serial No.126,129.

The present invention relates to threadsecting thelatter, the guides'18being pro- 7 cutting dies and more especially to improvevided with aflattened portion 18 and shoulments on the thread-cutting die formingthe der (not shown). subject matter of Letters Patent No. Also, in thepresent construction, the

1,563,108 issued Nov. 24, 1925, to the present chasers 16 areretained'in grooves 15. by 60 applicant. Y means of a ring 26 secured asby suitable In the device of the patent, the several screws to the endof body 10, beingfifdechasers are held in their respective groovessiredypositioned by means of pilot pins 29 by means of acap piece overthe forward before inserting the screws. 1 j

end. Therefore, in order to replace any 01 a The control sleeve .31isslidable onthe 65 all of the chasers, it is necessary to removebody-1O and is generally cylindrical in shape the cap piece by theremoval of several witha conical 'nner surface 32 at its outer screws. 1end, the angle of which is the same as the Among the objects of thepresentmvenangle of the outer ends 33. ofthe chasers.

tionis to overcome this difiiculty and enable This sleeve is movedmanually outward and 70 the replacement of the chasers quickly andforces the chasers inwardly'becauseof the without use of any other toolsand even inclination of their ,engaging surfaces. without removal of thedie from the lathe Sleeve 31 has an internal'radial flange 35 or othermachinev in which it is being used. against which small plungers 36 arepressed Other objects will readily. appear to those by the springs 37seated in longitudinal 76 skilled in the art upon reference to the acholes 38 in the body. The action of" these companying drawings in whichV springs is to force 'back the sleeve 31 when Fig. 1, is a longitudinalsection through released and permit thesprings 22 to'move the i thechaserslfi outwardly. Fig. 2, is a perspective vlew ofthe spacer Therear end 3901? the sleeve 31, the flange 80 r and the rear cap40 whichis secured t0 rmg; I

Fig. 3, is a similar view of one of the end 39 as by screws (notshownlconstitute chasers; I a chamber for thetrip-ring 43 which has aFig. 1, is a view taken on line 4-4 of finger l l'projecting out throughasuitable 30 Fig. 1. notch in theend 39. Aspring, shown in As in thepatent referred to the device section at 4:6 normallypushes this finger44 consists of a cylindrical body 10 having a outward. threadedextension 12 and a further 'eXten- The adjusting nut 18 preferably has'a cirsion 13 which may be called the shank as it cumferential flange 49provided with holes is received in the lathe turret or other sup- 50 toreceive a spanner wrench or othertool port fOI' the die. The centralhole 14: perby ineans of which it may be turned, The mits the work to beacted upon by the adjusting nut 48 extends into the trip ring chasersfor any desired distance. The fOr- 13 and has a circumferential shoulder57 ward end of the body 10 is formed With I'eC- adapted to be engagedthereby and to receive 4.0 angular radial grooves 15 for the chasers thethrust of this ring and of the sleeve 31. 16 and with radial round holes17 for the It will be noted that the distance between chaser guides 18which are hollow cylindriflang 49 of the adjusting nut 48 and rear calbodies enclosing springs 22 and carrycap 40 is a little greater than thedepth of ng the fi g 24 a p o p jec in the chasers 16, so that when thering 43 holes 25 in the chasers to permit the guides is, moved to permitthe springs 37 to push to force the chasers radially outward. The b k thle ve 31 d r leas th Ch s r rooves 15 and holes 17 are connected by thelatter will be cleared by the forward slots 23 which permit the fingers24 on the end of the sleeve and may be easily removed guides 18 toextend into the holes 25fand from the grooves 15, the removal beingperpermit radial movement of these parts. mitted by the'pivoted pins 24.In ordinary In the present construction the fingers 2 1 operation,however, it is not necessary or are pivoted to the ends of guides 18 asat desirable to entirely release thechasers 16 1 251 and the outwardmovement of the guides but only to allow the guides 18 to withdraw islimited by the heads of screws 20 in suitthem from the work. Therefore aremovable holes alongside of holes 17 and inter able spacer ring 60 isplaced the position indicated in Fig. 1 between flange 49 and cap 4-0;Vith this ring in place, the movement of sleeve 31 upon release by ring33 is only suflicient to allow withdrawal of the chasers from the worksutliciently to allow the latter to be removed.

Ring 60, best shown in Fig. 2, consists of a semi-cylinder 60 adapted tofit snugly described further.

Having now described the invention and the preferred form of embodimentthereof it is to be understood that the said invention is not to belimited to the specific details herein set forth and illustrated butonly by the scope of the claims which follow.

lQIn a die comprising a cylindrical body having radial grooves in itsforward end, spring pressed chasers slidable in said grooves and meansfor retaining said chasers in said grooves, a spring pressed sleeveslidable longitudinally on the body to fix the radial position of saidchasers in said grooves, means torelease said sleeve and permit it tomove longitudinally whereby to allowsaid chasers tomove radially outwardand to be removed from said grooves, a stop for said sleeve, and aremovable spacer ringbetweensaid stop and sleeve whereby the movement ofsaid sleeve may be limited to permit withdrawal of the chasers from thework while retaining them in the grooves.

2. A die consisting of a cylindrical body having radial grooves in itsforward end and plungcrs spring pressed outwardly adjacent to andparallel with said grooves, said plungers having lingers pivotally connected thereto and extending into said grooves, chasers slidably mountedin said grooves and provided with holes to receive said fingers, meansco-operating with the outer ends of said chasers to fix their radialposition, means to control said co-operating means for normal operationand other means permitting removal of said co-operating meanswherebysaid chasers may be withdrawn radially outward from said grooves.

A die consisting of a cylindrical body laving radial grooves in itsforward end, chasers slidable radially in said grooves and springpressed outwardly, said Chasers hav inginclined faces at their outerends, a sleeve slidably mounted on said body and provided within itsforward end with an inclined surface adapted to co-operate with theinclined surfaces on said Chasers to adjustably fix the radial positionof the. latter, means to cause sliding of said sleeve to a position inwhich thetwo inclined surfaces no longer cooperate and a spacer at therear of said sleeve to limit the sliding movement to such position thatthe inclined surfaces are still in contact but in which the chaser-s areoutside of the fixed adjusted position.

ALBERT J. FRANCE,

